发布于 2015-08-27 16:38:48 | 173 次阅读 | 评论: 0 | 来源: 网络整理
Once a user is authenticated, their credentials are typically stored in the
session. This means that when the session ends they will be logged out and
have to provide their login details again next time they wish to access the
application. You can allow users to choose to stay logged in for longer than
the session lasts using a cookie with the remember_me firewall option.
The firewall needs to have a secret key configured, which is used to encrypt
the cookie’s content. It also has several options with default values which
are shown here:
# app/config/security.yml
firewalls:
main:
remember_me:
key: "%secret%"
lifetime: 31536000 # 365 days in seconds
path: /
domain: ~ # Defaults to the current domain from $_SERVER
<!-- app/config/security.xml -->
<config>
<firewall>
<remember-me
key = "%secret%"
lifetime = "31536000" <!-- 365 days in seconds -->
path = "/"
domain = "" <!-- Defaults to the current domain from $_SERVER -->
/>
</firewall>
</config>
// app/config/security.php
$container->loadFromExtension('security', array(
'firewalls' => array(
'main' => array(
'remember_me' => array(
'key' => '%secret%',
'lifetime' => 31536000, // 365 days in seconds
'path' => '/',
'domain' => '', // Defaults to the current domain from $_SERVER
),
),
),
));
It’s a good idea to provide the user with the option to use or not use the
remember me functionality, as it will not always be appropriate. The usual
way of doing this is to add a checkbox to the login form. By giving the checkbox
the name _remember_me, the cookie will automatically be set when the checkbox
is checked and the user successfully logs in. So, your specific login form
might ultimately look like this:
{# src/Acme/SecurityBundle/Resources/views/Security/login.html.twig #}
{% if error %}
<div>{{ error.message }}</div>
{% endif %}
<form action="{{ path('login_check') }}" method="post">
<label for="username">Username:</label>
<input type="text" id="username" name="_username" value="{{ last_username }}" />
<label for="password">Password:</label>
<input type="password" id="password" name="_password" />
<input type="checkbox" id="remember_me" name="_remember_me" checked />
<label for="remember_me">Keep me logged in</label>
<input type="submit" name="login" />
</form>
<!-- src/Acme/SecurityBundle/Resources/views/Security/login.html.php -->
<?php if ($error): ?>
<div><?php echo $error->getMessage() ?></div>
<?php endif ?>
<form action="<?php echo $view['router']->generate('login_check') ?>" method="post">
<label for="username">Username:</label>
<input type="text" id="username"
name="_username" value="<?php echo $last_username ?>" />
<label for="password">Password:</label>
<input type="password" id="password" name="_password" />
<input type="checkbox" id="remember_me" name="_remember_me" checked />
<label for="remember_me">Keep me logged in</label>
<input type="submit" name="login" />
</form>
The user will then automatically be logged in on subsequent visits while the cookie remains valid.
When the user returns to your site, they are authenticated automatically based on the information stored in the remember me cookie. This allows the user to access protected resources as if the user had actually authenticated upon visiting the site.
In some cases, however, you may want to force the user to actually re-authenticate before accessing certain resources. For example, you might allow “remember me” users to see basic account information, but then require them to actually re-authenticate before modifying that information.
The Security component provides an easy way to do this. In addition to roles explicitly assigned to them, users are automatically given one of the following roles depending on how they are authenticated:
IS_AUTHENTICATED_ANONYMOUSLY - automatically assigned to a user who is
in a firewall protected part of the site but who has not actually logged in.
This is only possible if anonymous access has been allowed.IS_AUTHENTICATED_REMEMBERED - automatically assigned to a user who
was authenticated via a remember me cookie.IS_AUTHENTICATED_FULLY - automatically assigned to a user that has
provided their login details during the current session.You can use these to control access beyond the explicitly assigned roles.
注解
If you have the IS_AUTHENTICATED_REMEMBERED role, then you also
have the IS_AUTHENTICATED_ANONYMOUSLY role. If you have the IS_AUTHENTICATED_FULLY
role, then you also have the other two roles. In other words, these roles
represent three levels of increasing “strength” of authentication.
You can use these additional roles for finer grained control over access to
parts of a site. For example, you may want your user to be able to view their
account at /account when authenticated by cookie but to have to provide
their login details to be able to edit the account details. You can do this
by securing specific controller actions using these roles. The edit action
in the controller could be secured using the service context.
In the following example, the action is only allowed if the user has the
IS_AUTHENTICATED_FULLY role.
// ...
use SymfonyComponentSecurityCoreExceptionAccessDeniedException
public function editAction()
{
$this->denyAccessUnlessGranted('IS_AUTHENTICATED_FULLY');
// ...
}
If your application is based on the Symfony Standard Edition, you can also secure your controller using annotations:
use SensioBundleFrameworkExtraBundleConfigurationSecurity;
/**
* @Security("has_role('IS_AUTHENTICATED_FULLY')")
*/
public function editAction($name)
{
// ...
}
小技巧
If you also had an access control in your security configuration that
required the user to have a ROLE_USER role in order to access any
of the account area, then you’d have the following situation:
ROLE_USER role per your configuration, the user
will have the IS_AUTHENTICATED_FULLY role and be able to access
any page in the account section, including the editAction controller.editAction controller, they will be forced to re-authenticate, since
they are not, yet, fully authenticated.For more information on securing services or methods in this way, see How to Secure any Service or Method in your Application.